IS 'massacres hundreds of men and boys' in Mosul while 1,000 treated in hospital over toxic fumes

Civilians return to their village after it was liberated from Islamic State militants, south of Mosul in Qayyara, Iraq, October 22, 2016. The fumes in the background are from oil wells that were set ablaze by Islamic State militants. REUTERS/Alaa Al-Marjani

The so-called Islamic State has reportedly massacred hundreds of men and boys in Mosul who were used as human shields against approaching Iraqi-led forces.

The jihadist group rounded up and shot 284 males before dumping their corpses in a mass grave at a former agriculture college in northern Mosul, according to CNN.

An Iraqi army vehicle is seen during an operation to attack Islamic State militants in Mosul, in Qayyara, Iraq, October 22, 2016. REUTERS/Alaa Al-MarjaniA man returns to his village after it was liberated from Islamic State militants, south of Mosul in Qayyara, Iraq, October 22, 2016. The fumes in the background are from oil wells that were set ablaze by Islamic State militants. REUTERS/Alaa Al-Marjani

They were reportedly lined up and shot on the grounds of a campus where young Iraqis were once taught how to grow food in their country’s punishing climate and then buried by bulldozer.

The alleged massacre came after the United Nations voiced fears for 550 families who had been seized from nearby villages this week and marched into Mosul.

Meanwhile up to 1,000 people have been treated for breathing problems linked to fumes from a sulphur plant set ablaze during fighting with IS and U.S. officials say U.S. forces at a nearby airfield are wearing protective masks.

A cloud of white smoke blanketed the area around the Mishraq sulphur plant, near Mosul, mingling with black fumes from oil wells that the militants torched to cover their moves.

An Iraqi special forces soldier fires an RPG during clashes with Islamic States fighters in Bartella, east of Mosul, Iraq REUTERSDisplaced children who fled Islamic State militants from Mosul pose for pictures at Deepaka camp in the northwest of Erbil, during an operation to attack Islamic State militants in Mosul, Iraq

Local residents and the U.S. military said Islamic State militants deliberately set the sulphur plant ablaze as they strive to repel an offensive by Iraqi government forces to drive them from Mosul, their last major stronghold in the country.

Up to 1,000 people have been admitted to the nearby Qayyara central hospital with respiratory problems since Friday morning and later released, according to hospital director Abdul Salam Jabbouri. No deaths have been reported at the hospital.

"We have had every type of person come in with breathing problems and burning eyes - children, adults, policemen, soldiers," said Jabbouri. "Daesh set the sulphur on fire so nobody can come near them."

Daesh is an Arabic acronym for Islamic State.

The Qayyara West airfield is the main U.S. hub to support Iraqi-led operations to retake Mosul. There are about 5,000 U.S. troops in Iraq but the U.S. military has not disclosed the number of personnel at the airfield.

"The winds have actually shifted south, so, as a precautionary measure, the troops at Qayyara West have donned their personal protective equipment - continuing their operations at this point in time," an official said on Saturday, speaking on condition of anonymity.

A Reuters reporter in Qayyara saw Iraqi soldiers wearing gas masks on top of their heads, ready to pull them down

In an examination room at Qayyara hospital, a baby, suffering from inhalation of sulphur fumes, screamed and coughed on Saturday as his father held an oxygen mask over his face.

Most patients have been given oxygen and told to stay away from areas with high sulphur concentration, according to medical aide Saddam Ahmad, who was wearing a surgical mask to protect him from the fumes.

"We've had so many patients since yesterday that we're almost out of oxygen," Ahmad said.

Ali Ahmad Khalaf, 38, who lives in a nearby village, said he had moved his family to Qayyara to escape the fumes.

"The sulphur is very dangerous," Khalaf, wearing a surgical mask and a traditional dishdasha robe, said. "Daesh just wants to kill us."

Standing nearby, Bassam Qazi overheard Khalaf and said: "I saw an old man who had choked and died from the smoke."

Air samples from Qayyara West were sent to the U.S. Defense Threat Reduction Agency for analysis as to "what, if any concerns, may result," another U.S. official said.

U.S officials said Islamic State set the sulphur plant ablaze on Thursday during fighting around al-Mishraq, south of Mosul.

Iraqi state TV said the fire had been "brought under control" on Saturday, but the Reuters reporter on the scene said smoke was still visible from a distance late in the day.

Operation Inherent Resolve, the official name of the U.S-led anti-Islamic State coalition, said in a statement on Saturday it had provided more than 24,000 protective chemical masks to the Iraqi security forces and the allied Kurdish Peshmerga fighters during training for the Mosul offensive.

Separately, the coalition said Qayyara airfield started receiving cargo aircraft on Friday, after U.S. Air Force engineers repaired it.